Suspension bolts

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BiggestNizzy
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Re: Suspension bolts

Post by BiggestNizzy » Sun Oct 19, 2014 5:17 pm

The non threaded part of the bolt is stronger in sheer than the threaded part, both are the same strenth in tension. If you have a M12 bolt in sheer the difference in thickness is 10.8mm v 12mm.
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Mike Scib
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Re: Suspension bolts

Post by Mike Scib » Tue Oct 21, 2014 4:39 pm

BiggestNizzy wrote:The non threaded part of the bolt is stronger in sheer than the threaded part, both are the same strenth in tension. If you have a M12 bolt in sheer the difference in thickness is 10.8mm v 12mm.
Surely the bolt is only as strong as its weakest point?
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Stephen
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Re: Suspension bolts

Post by Stephen » Tue Oct 21, 2014 4:56 pm

It depends on the direction of the forces.
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Re: Suspension bolts

Post by BiggestNizzy » Tue Oct 21, 2014 9:40 pm

In tension it doesn't matter as a full thread bolt has the same cross section as a bolt that's only threaded half way. In shear its the diameter that matters.

You also only need about 6 threads for full clamping force. No need to have a screw stuck in 50mm (please note if you work in design for an oil and gas company, those things are a bitch to tap)
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Stephen
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Re: Suspension bolts

Post by Stephen » Tue Oct 21, 2014 10:26 pm

I was trained by an old engineer who said the system got to 100% strength when the distance the nut was screwed on was half the diameter of the bolt. Not sure if this is correct but is one of those guides that just seems right
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Re: Suspension bolts

Post by Mikie711 » Tue Oct 21, 2014 11:07 pm

Stephen wrote:I was trained by an old engineer who said the system got to 100% strength when the distance the nut was screwed on was half the diameter of the bolt. Not sure if this is correct but is one of those guides that just seems right
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woody
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Re: Suspension bolts

Post by woody » Wed Oct 22, 2014 12:46 pm

We work to a minimum of 2 threads showing on a fully fastened nut & bolt, however the vast majority use K lock nuts.
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